thunderbird and lightning

Last time I used Windows XP as my main OS, I was using Outlook 2003. If you're wondering why I was using Outlook as my MUA (mail user agent), it's because it integrates with my pda via activesync. Calendar, email and contacts are synchronized. Now, I am using Debian GNU Linux. What are my options? None. Although I don't use my pda anymore I still need a better mua that has at least a calendar, html and image viewing feature.

I tried using Sylpheed, Sylpheed-claws and Thunderbird. Sylpheed is the fastest (send, receive and loading) but Thunderbird is more complete. I have a lot of email addresses (14 to be exact) and Thunderbird handles them well (spam filter, thread sort, images, html etc). The only problem is a calendar feature. Last month Mozilla release Sunbird 0.5 and I just found out lately that they also released Lightning 0.5 (the standalone plugin for Thunderbird). Sunbird and Lightning is the calendar application I was looking for and frankly it's in par with Outlook.

I tested adding events, tasks and alarm. All are working great. I've added some screenshots of Thunderbird with Lightning installed.